Finding the Fourth Proportional to 155.89, 233.98 and 90.96

Step by Step Solution

1. Step 1: Write the proportion equation
   155.89 : 233.98 = 90.96 : x
2. Step 2: Convert to fraction form
   155.89/233.98 = 90.96/x
3. Step 3: Cross multiply
   155.89x = 233.98 × 90.96
4. Step 4: Simplify right side
   155.89x = 21,282.82
5. Step 5: Solve for x
   x = 21,282.82/155.89
6. Step 6: Final answer
   x = 136.52